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Module ADM digital radio

Digital Radio

Rapid development and appearance of new microelectronic digital and analog-digital components allows producing high-quality receiver based on radio signal digital processing.

Digital processing of signal in receiving systems might be used at the point of radio track, where frequency of the signal is so low that the signal can be digitized without losses using ADC. Then signal readings can be processed by digital signal processor or specialized processor. Processing signal at zero intermediate frequency (video frequency) is the most advantageous way from the point of DSP. At this point digitization frequency and correspondingly data flow to the signal processor speed are at minimum. So more time is dedicated to processing signal itself than to signal input/output operations. Processing scheme should be quadrature.

Digital radio modules ADMDDC:

Module name

Number and type of ADC

Max. frequency of discretization
digit capacity

Number and type of DDC

Max. clock frequency of DDC

ADMDDC2WBL16

2xAD7671

1 MHz, 16bit

2 х AD6620

65 MHz

ADMDDC2WBL

2xAD6644

65 MHz, 14bit

2 х AD6620

65 MHz

ADMDDC2WBH

2xAD9432

80 MHz, 12bit

2 х AD6620

65 MHz

ADMDDC8WBL

8xAD9240

15 MHz, 14bit

8 х AD6620

60 MHz

ADMDDC8WB

8xAD9435

65 MHz, 12bit

8 х AD6620

65 MHz

ADMDDC8WBv2.0

8xAD9245

65 MHz, 14bit

8 х AD6620

65 MHz

ADMDDC5016

2xAD9430

200 MHz, 12bit

1xGC5016

200 MHz

ADMDDC416x100M

4xLT2207

100 MHz, 16bit

1xGC5016

100 MHz

ADMDDC4x16v3.0

4xLT2207

100 MHz, 16bit

4xGC4016

100 MHz

 

Advantages of digital processing of radio signal over:

  • Stability of processing parameters. Stability of frequency setup is quite high for analog receivers with frequency synthesizers. But characteristics of mixers, filters and demodulators change because of time and temperature.
  • Ability of automatic adaptation to reception conditions and to signal character. Adaptation includes optimizing structure, characteristic and parameters of receiver and all devices included in reception complex;
  • Ability to work with both conventional and new modulation types, coded signal and signal with time and frequency channel compaction at acceptable weight, size and price characteristics (for analog processing these parameters rise dramatically along with modulation complication);
  • Reducing setup time, ability to work with variable frequency by using new approaches to heterodyne construction (синтезатора частоты), using digital processing for getting intermediate frequency with wide band of specter panorama of range of frequencies being received and digital analysis of this specter;
  • Multichannelity with identical channel characteristics. Principle realization: one receiver Ц many receiving channels,
  • Ability of monitoring the specter of frequencies received. This feature was implemented by expensive panorama attachments. Specter monitoring function during digital processing is implemented by signal processors by FFT of different length and statistic processing of specter;
  • Installing receiver into computing processing complex opens new possibilities. Earlier analog receivers may have been only controlled by computers (frequency rearrangement, amplification and filter control, choosing demodulator). But now digital data flow from receiver is brought into computer for further processing and/or saving. The receiver itself might be made as a module installed into crate of computing system or PC;
  • Reduced weight, size and scheme simplifying lead to increased reliability;
  • Reduced cost in relation to analog receiver.

 

InSys Micro Inc., New York

E-mail: Sales@InSys-USA.com